"""x=int(input())
y=int(input())
z=int(input())
z=z/10
a=0
while x<=y:
    if z-x>=0:
        a+=z-x
    else:
        a+=-(z-x)
    x+=1
print(a)
"""

a=0
b=0
c=10
d=0.001
while a+b<2*c+1:
    if a-b==5:
        if a*b==-1:
            print(a,b)
    a+=d
    if a>=c:
        a=0
        b+=d
print("ok")